Smoke-stack coupling.



No. ss|,|as-.- Pata ntod 'Nov. '6, I900.

' a. MITCHEL.

SMOKE STACK COUPLING.

(Application filed Aug. 21, 1099;

(No Model.)

TN: NDRRKS PETER$ cc PNOTD LITHOU WENINGYON. D. c.

UNITED STATES PATENT QEFI E.

BIRTRUM MITCHEL, OF OOONOMOWOG, WISCONSIN.

SMOKE-STACK COUPLING.

SPECIFICATION forming part of Letters Patent No. 661,186, dated November6, 1900.

Application filed August 21, 1899- fierial No. 727,938. (No model.)

To all whom it may concern.-

Be it known that I, BIRTRUM MIToHEL,a citi- Zen of the United States,and a resident of "Oconomowoc, in the county of Waukesha and State ofWisconsin, have invented certain new and useful Improvements inSmoke-Stack Couplings; and I do hereby declare that the following is afull, clear, and exact description thereof.

My invention has especial reference to couplings for the smoke-stacks ofvertical stationary boilers; and it consists in certain peculiarities ofconstruction and combination of parts, as will be fully set forthhereinafter and subsequently claimed.

In the drawings, Figure 1 is an elevation, partly broken away or insection, showing my invention appliedto the smoke-stack of a verticalboiler. Fig. 2 is a horizontal sectional view taken on the line 2 2 ofFig. 3. Fig; 3 is a detail elevation showing my device fastened in placeon a smoke-stack.

Heretofore the cleaning of the flues of a vertical stationary boiler hasbeen a matter of considerable inconvenience; and the principal object ofmy present invention is to obviate this difficulty, although my saidinvention is applicable wherever a divided smoke-stack or smoke-pipe maybe employed.

Referring to the drawings, A represents the upper part of a verticalsteam-boiler of the ordinary type, having the usual vertical flues o; a.B represents the dome of said boiler, resting on the upper end of thelatter, to which it is removably secured by bolts b 12 passing throughflanges on the dome, the said bolts having proper nuts on their upperouter ends for the ready attachment or detachment of the said dome whenrequired.

0 represents the lower short section of the smoke-stack, made rigid withthe dome, and D the upper and principal part of the said smoke-stack,shown passing through the roof E over the boiler, said stack D beingsuspended from said roof by means of the collar F, secured to the stackand resting on the upper surface of the said roof, as shown, so that theopposing end edges of the sections 0 D of the smoke-stack will beslightly separated.

G represents the collar of my coupling, the same consisting, preferably,of a strip of gal- Vanized iron having overlapping ends 0 d.

The end 0 is provided with two screw-bolts e e, passing therethrough,and is further formed with a keyhole-slot ff on a line intermediate ofthe said bolts. A pair of screw-bolts g g are formed with theirunthreaded ends shouldered or offset, as shown at h, said ends beingfree from the ordinary boltheads; but in place thereof each bolt end isbent into a coil or ring?) to receive and snugly'fit around thedescribed screw-bolts e, to which said ends are tightly secured by nutsjj. The end at of the collar G has secured thereto a headed rivet k, thehead of said rivet being of asize to slip through the large end f of thekeyholeslot in the end 0 of the collar, and the shank of said rivetbeing of the proper diameter to move in the narrower part f of said slotwhen the two ends are put together, as shown in Figs. 2 and 3. At alittle distance back from and on each side of said headed rivet k theend cl of the collar G is provided with two angle-plates m m, which aresecured to the collar end by rivetsn n, the projecting ends of saidplates n having holes thereihrough for the reception of the threadedends of'the described bolts g'g, the two ends 0 d of the collar G beingdrawn together and tightened to place around the divided sections 0 D ofthe smoke-stack by means of the thumb-nuts 0 0 on the ends of said bolts9 g.

When it is desired to clean the vertical flues a C6 of the boiler, thethumb-nuts 0 0 are loosened and the collar G slipped on one of thesections of the divided smoke stack above or below the line ofseparation and the bolts b b, which secure the dome B to'the boiler A,removed, and then the said dome, with its attached lower section (3 ofsmoke-stack, is bodily slid off the top of the boiler, and all of theflues a dare exposed, so as to be readily and quickly cleaned by anysuitable appliance, after which the dome is replaced and fastened to theboiler and the collar G restored to its former position and tightened toplace, as before, this last operation being quickly performed and withthe described thumb-nuts 0 0 not even requiring the use of a Wrench inthe loosening and tightening of said collar. If

desired, the nuts on the bolts 1) b may also be thumb-nuts.

My invention will be found of great convenience and utility tostationary engineers for the purpose described and, as stated, is

also capable of general use wherever divided smoke stacks or pipes areemployed.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. The combination with a divided smokestack, the sections of which areheld out of contact with each other, of a sheet-metal split collar,having overlapping ends, surrounding the said smoke-stack, and coveringthe space between the said two separated sections there of, one of saidends having a projecting headed rivet, and the other of said ends beingprovided with a keyhole-slot for the reception of said headed rivet,whereby the said ends are adjustal'ily held together in an overlappedposition, together with suitable means for diminishing the circumferenceof said collar, while the ends are thus held together.

2. In a removable split collar, the combination with an integral band ofsheet metal bent into tubular form, with overlapping ends, of

eeifls a pair of angle-plates secured to one of said ends, the freeprojecting portions of said angle-plates having round smooth-boredperforations therethrough; a pair of screw-bolts formed with theirunthreaded ends shouldered or ofiset, and said shouldered ends beingbent into a coil or ring, and rigidly and immovably secured byscrew-bolts and nuts to the other of said overlapping ends, with thethreaded ends ofsaid first-nan] ed screw-bolts projecting in line withthe described perfora tions in said angle-plates; and tighteningnuts forengagement with said projecting threaded ends after the same have passedthrough theperforat-ions in said angle plates.

In testimony that I claim the foregoing I have hereunto set my hand, atMilwaukee, in the county of Milwaukee and State of Wiscousin, thepresence of two witnesses.

BIRTRUM MITOHEL,

Witnesses:

UNDERWOOD, B. C. ROLOFF.

